• 
  John Laughlin

  Det. Kay
• 
  Jeremy Lelliott

  Little Stevie
• 
  Adam Baldwin

  John Gacy, Sr.
• 
  Charlie Weber

  Tom Kovacs
• 
  Mark Holton

  John Wayne Gacy, Jr.
• 
  Rick Dean

  Ray
• 
  Owen Williams
• 
  Oren Skoog

  Jimmy

• 
  Allison Lange

  Gretchen
• 
  Larry Hankin

  Eddie Bloom
• 
  Glenn Morshower

  Ted Boyle

• 
  Ricki Maslar

  casting director
• 
  Erik Godal

  departament sunet
• 
  Oakley Stevenson

  costume and wardrobe departmen
• 
  Jeff Orgill

  montaj

• 
  Wendy Schaal

  miscellaneous crew
• 
  Erik Godal

  music department
• 
  Tim Swain

  producător
• 
  Susan R. Rodgers

  producător
• 
  Jeff Orgill

  production manager
• 
  Matt Zettell

  second unit director or assist